<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>固定定位学习的课堂作业</title>
    <style>
        .content{
            width: 60%;
            height: auto;
            margin: 15px auto;
        }
        .g1{
            width: 80%;
            height: auto;

        }
        #l{
            position: fixed;
            bottom: 0;
            left: 0;
        }
        #r{
            position: fixed;
            bottom: 0;
            right: 0;
        }
    </style>
</head>
<body>
    <div class="content">
        <img src = "../2.css/img/box.png">
    </div>
    <div class="g1">
        <img src = "../2.css/img/ad-l.png" id="l">
        <img src = "../2.css/img/ad-r.png" id="r">
    </div>
</body>
</html>